If the price in dollars of a stereo system is given by $p(q)=\frac{12600}{q^2}+1500,$ where $q$ represents the demand for the product, find the marginal revenue when the demand is $30.$

What is the formula for the revenue function?

A$.R(q)=p^{\text{'}}p$

B$.R(q)=p^{\text{'}}q$

c$.R(q)=\frac{p}{q}$

D$.R(q)=pq$

The marginal revenue for the given demand is $